RANKING · 2010 CENSUS · 56 SHOWN OF 56

Most sparsely populated, Montana counties · 2010

Montana counties with the fewest residents per square mile (2023). This list covers the 56 counties in Montana that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most densely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Garfield County, MTMT1,1480−6%

02Petroleum County, MTMT5480+0%

03Carter County, MTMT1,3830−15%

04Powder River County, MTMT1,7811−6%

05McCone County, MTMT1,7201−12%

06Prairie County, MTMT1,1121−2%

07Treasure County, MTMT7281−17%

08Golden Valley County, MTMT8441−15%

09Meagher County, MTMT2,1371−2%

10Phillips County, MTMT4,2031−8%

11Judith Basin County, MTMT2,1621−11%

12Wibaux County, MTMT8851−5%

13Daniels County, MTMT1,6121−13%

14Chouteau County, MTMT5,8651−3%

15Valley County, MTMT7,3851−4%

16Wheatland County, MTMT2,1002−4%

17Blaine County, MTMT6,8602−7%

18Liberty County, MTMT1,9572+8%

19Beaverhead County, MTMT10,0432+0%

20Granite County, MTMT3,6582+9%

21Fallon County, MTMT2,9592+2%

22Rosebud County, MTMT8,2532−2%

23Sweet Grass County, MTMT3,7622+1%

24Sheridan County, MTMT3,4362−18%

25Madison County, MTMT10,0262+12%

26Musselshell County, MTMT5,5822+1%

27Big Horn County, MTMT12,7523+2%

28Fergus County, MTMT11,8253−3%

29Teton County, MTMT6,4963−6%

30Toole County, MTMT5,2113+1%

31Powell County, MTMT7,1573−2%

32Custer County, MTMT12,0343+0%

33Mineral County, MTMT5,1853+9%

34Dawson County, MTMT8,6924−1%

35Pondera County, MTMT6,0724−4%

36Sanders County, MTMT14,0624+12%

37Roosevelt County, MTMT10,2424−2%

38Glacier County, MTMT13,4634+1%

39Richland County, MTMT11,3775+1%

40Broadwater County, MTMT8,4935+28%

41Carbon County, MTMT11,4665+6%

42Stillwater County, MTMT9,4455+11%

43Lincoln County, MTMT22,3285+5%

44Hill County, MTMT16,1676−3%

45Park County, MTMT18,2146−0%

46Jefferson County, MTMT13,3297+14%

47Deer Lodge County, MTMT9,70913−1%

48Ravalli County, MTMT48,58217+11%

49Flathead County, MTMT115,42918+22%

50Lewis and Clark County, MTMT75,33118+14%

51Lake County, MTMT33,39219+8%

52Cascade County, MTMT85,02930+1%

53Gallatin County, MTMT128,74034+32%

54Missoula County, MTMT123,51342+14%

55Silver Bow County, MTMT36,11848−1%

56Yellowstone County, MTMT172,69256+14%

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES